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<h3 id="12-网络编程–Netty-实践-心跳检测"><a href="#12-网络编程–Netty-实践-心跳检测" class="headerlink" title="12.网络编程–Netty-实践-心跳检测"></a>12.网络编程–Netty-实践-心跳检测</h3><h5 id="序言"><a href="#序言" class="headerlink" title="序言"></a>序言</h5><hr>
<ol>
<li>：网络编程–Netty-实践<ul>
<li>心跳检测</li>
</ul>
</li>
</ol>
<hr>
<h5 id="服务端开发"><a href="#服务端开发" class="headerlink" title="服务端开发"></a>服务端开发</h5><p>&#8195;&#8195;使用Socket通信一般经常用来处理多个服务器之间的心跳检测，一般来讲，我们去维护服务器集群，肯定有一台主服务器还应该有N台从服务器，那么我们主机需要时时刻刻知道从服务器的健康情况，然后进行实时的监控，在这个分布式架构里叫做心跳检测或者叫心跳监控，Netty可以做这样的一件事情，可以使用Netty完成这个任务。</p>
<h5 id="下面我们看下示例："><a href="#下面我们看下示例：" class="headerlink" title="下面我们看下示例："></a>下面我们看下示例：</h5><p>&#8195;&#8195;首先工程需要引入netty的jar包<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>io.netty<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>netty-all<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">version</span>&gt;</span>5.0.0.Alpha2<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<h5 id="第一步：服务端开发-WebSocketServer启动类。"><a href="#第一步：服务端开发-WebSocketServer启动类。" class="headerlink" title="第一步：服务端开发 WebSocketServer启动类。"></a>第一步：服务端开发 WebSocketServer启动类。</h5><p>&#8195;&#8195;websocket服务端的功能如下：服务端对请求的消息进行判断，如果第一次请求为http请求，进行握手连接；如果为合法的websocket，获取请求的消息文本，在其前面追加字符串”服务器收到并返回：。</p>
<h5 id="第一步-建立接收消息的处理规则-其实已经发现了-服务端的代码其实都是差不多-模板一样-只是对于Handler存在差异"><a href="#第一步-建立接收消息的处理规则-其实已经发现了-服务端的代码其实都是差不多-模板一样-只是对于Handler存在差异" class="headerlink" title="第一步 建立接收消息的处理规则 其实已经发现了 服务端的代码其实都是差不多 模板一样 只是对于Handler存在差异"></a>第一步 建立接收消息的处理规则 其实已经发现了 服务端的代码其实都是差不多 模板一样 只是对于Handler存在差异</h5><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 服务端处理ServerHandler. 本示例 会对client进行回复</span></span><br><span class="line"><span class="comment"> * 继承自 ChannelHandlerAdapter， 这个类实现了ChannelHandler接口， ChannelHandler提供了许多事件处理的接口方法，</span></span><br><span class="line"><span class="comment"> * 然后你可以覆盖这些方法。 现在仅仅只需要继承ChannelHandlerAdapter类而不是你自己去实现接口方法。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ServerHeartBeatHandler</span> <span class="keyword">extends</span> <span class="title">ChannelHandlerAdapter</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="comment">/** key:ip value:auth */</span></span><br><span class="line">	<span class="keyword">private</span> <span class="keyword">static</span> HashMap&lt;String, String&gt; AUTH_IP_MAP = <span class="keyword">new</span> HashMap&lt;String, String&gt;();</span><br><span class="line">	<span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> String SUCCESS_KEY = <span class="string">"auth_success_key"</span>;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">static</span> &#123;</span><br><span class="line">		AUTH_IP_MAP.put(<span class="string">"192.168.0.1"</span>, <span class="string">"1234"</span>);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">private</span> <span class="keyword">boolean</span> <span class="title">auth</span><span class="params">(ChannelHandlerContext ctx, Object msg)</span></span>&#123;</span><br><span class="line">			<span class="comment">//System.out.println(msg);</span></span><br><span class="line">			String [] ret = ((String) msg).split(<span class="string">","</span>);</span><br><span class="line">			String auth = AUTH_IP_MAP.get(ret[<span class="number">0</span>]);</span><br><span class="line">			<span class="keyword">if</span>(auth != <span class="keyword">null</span> &amp;&amp; auth.equals(ret[<span class="number">1</span>]))&#123;</span><br><span class="line">				ctx.writeAndFlush(SUCCESS_KEY);</span><br><span class="line">				<span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">			&#125; <span class="keyword">else</span> &#123;</span><br><span class="line">				ctx.writeAndFlush(<span class="string">"auth failure !"</span>).addListener(ChannelFutureListener.CLOSE);</span><br><span class="line">				<span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line">			&#125;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">channelRead</span><span class="params">(ChannelHandlerContext ctx, Object msg)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		<span class="keyword">if</span>(msg <span class="keyword">instanceof</span> String)&#123;</span><br><span class="line">			auth(ctx, msg);</span><br><span class="line">		&#125; <span class="keyword">else</span> <span class="keyword">if</span> (msg <span class="keyword">instanceof</span> RequestInfo) &#123;</span><br><span class="line"></span><br><span class="line">			RequestInfo info = (RequestInfo) msg;</span><br><span class="line">			System.out.println(<span class="string">"--------------------------------------------"</span>);</span><br><span class="line">			System.out.println(<span class="string">"当前主机ip为: "</span> + info.getIp());</span><br><span class="line">			System.out.println(<span class="string">"当前主机cpu情况: "</span>);</span><br><span class="line">			HashMap&lt;String, Object&gt; cpu = info.getCpuPercMap();</span><br><span class="line">			System.out.println(<span class="string">"总使用率: "</span> + cpu.get(<span class="string">"combined"</span>));</span><br><span class="line">			System.out.println(<span class="string">"用户使用率: "</span> + cpu.get(<span class="string">"user"</span>));</span><br><span class="line">			System.out.println(<span class="string">"系统使用率: "</span> + cpu.get(<span class="string">"sys"</span>));</span><br><span class="line">			System.out.println(<span class="string">"等待率: "</span> + cpu.get(<span class="string">"wait"</span>));</span><br><span class="line">			System.out.println(<span class="string">"空闲率: "</span> + cpu.get(<span class="string">"idle"</span>));</span><br><span class="line"></span><br><span class="line">			System.out.println(<span class="string">"当前主机memory情况: "</span>);</span><br><span class="line">			HashMap&lt;String, Object&gt; memory = info.getMemoryMap();</span><br><span class="line">			System.out.println(<span class="string">"内存总量: "</span> + memory.get(<span class="string">"total"</span>));</span><br><span class="line">			System.out.println(<span class="string">"当前内存使用量: "</span> + memory.get(<span class="string">"used"</span>));</span><br><span class="line">			System.out.println(<span class="string">"当前内存剩余量: "</span> + memory.get(<span class="string">"free"</span>));</span><br><span class="line">			System.out.println(<span class="string">"--------------------------------------------"</span>);</span><br><span class="line"></span><br><span class="line">			ctx.writeAndFlush(<span class="string">"info received!"</span>);</span><br><span class="line">		&#125; <span class="keyword">else</span> &#123;</span><br><span class="line">			ctx.writeAndFlush(<span class="string">"connect failure!"</span>).addListener(ChannelFutureListener.CLOSE);</span><br><span class="line">		&#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h5 id="第二步：实现Server-建立相应的规则，配置参数-编程模式还是一样。"><a href="#第二步：实现Server-建立相应的规则，配置参数-编程模式还是一样。" class="headerlink" title="第二步：实现Server 建立相应的规则，配置参数 编程模式还是一样。"></a>第二步：实现Server 建立相应的规则，配置参数 编程模式还是一样。</h5><p>&#8195;&#8195;就是说，我们建立了接收消息的规则，但是光建立规则有什么用，仅仅只是一个规则，我们需要把这个规则”应用“起来，通常就是我们通常的”运行“。<br>&#8195;&#8195;引导过程中所需要的步骤如下：</p>
<ul>
<li>创建并分配2个NioEventLoopGroup实例以进行事件的处理，一个用于网络的事件处理（接收客服端的连接），一个进行网络通信的读写；</li>
<li>创建一个ServerBootstrap的实例以引导和绑定服务器，配置Netty的一系列参数；</li>
<li>创建一个实际处理数据的类ChannelInitializer，进行初始化的准备工作，比如设置接收传出的数据字符集，格式，已经实现了处理数据的接口；</li>
<li>绑端口；调用ServerBootstrap.bind()方法以绑定服务器，执行同步阻塞的方法等待服务器端启动；</li>
<li>注意别忘了这句(cf1.channel().closeFuture().sync();) ，不然启动就自动运行完主函数 通道就关闭了。</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Server</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> Exception</span>&#123;</span><br><span class="line"></span><br><span class="line">		EventLoopGroup pGroup = <span class="keyword">new</span> NioEventLoopGroup();</span><br><span class="line">		EventLoopGroup cGroup = <span class="keyword">new</span> NioEventLoopGroup();</span><br><span class="line"></span><br><span class="line">		ServerBootstrap b = <span class="keyword">new</span> ServerBootstrap();</span><br><span class="line">		b.group(pGroup, cGroup)</span><br><span class="line">		 .channel(NioServerSocketChannel.class)</span><br><span class="line">		 .option(ChannelOption.SO_BACKLOG, <span class="number">1024</span>)</span><br><span class="line">		 <span class="comment">//设置日志</span></span><br><span class="line">		 .handler(<span class="keyword">new</span> LoggingHandler(LogLevel.INFO))</span><br><span class="line">		 .childHandler(<span class="keyword">new</span> ChannelInitializer&lt;SocketChannel&gt;() &#123;</span><br><span class="line">        <span class="meta">@Override</span></span><br><span class="line">  			<span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">initChannel</span><span class="params">(SocketChannel sc)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">  				sc.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingDecoder());</span><br><span class="line">  				sc.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingEncoder());</span><br><span class="line">  				sc.pipeline().addLast(<span class="keyword">new</span> ServerHeartBeatHandler());</span><br><span class="line">  			&#125;</span><br><span class="line">		&#125;);</span><br><span class="line"></span><br><span class="line">		ChannelFuture cf = b.bind(<span class="number">8765</span>).sync();</span><br><span class="line"></span><br><span class="line">		cf.channel().closeFuture().sync();</span><br><span class="line">		pGroup.shutdownGracefully();</span><br><span class="line">		cGroup.shutdownGracefully();</span><br><span class="line"></span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h6 id="第三步-创建Jboss-Marshalling解码器MarshallingDecoder"><a href="#第三步-创建Jboss-Marshalling解码器MarshallingDecoder" class="headerlink" title="第三步 创建Jboss Marshalling解码器MarshallingDecoder"></a>第三步 创建Jboss Marshalling解码器MarshallingDecoder</h6><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">final</span> <span class="class"><span class="keyword">class</span> <span class="title">MarshallingCodeCFactory</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * 创建Jboss Marshalling解码器MarshallingDecoder</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@return</span> MarshallingDecoder</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> MarshallingDecoder <span class="title">buildMarshallingDecoder</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    	<span class="comment">//首先通过Marshalling工具类的精通方法获取Marshalling实例对象 参数serial标识创建的是java序列化工厂对象。</span></span><br><span class="line">		<span class="keyword">final</span> MarshallerFactory marshallerFactory = Marshalling.getProvidedMarshallerFactory(<span class="string">"serial"</span>);</span><br><span class="line">		<span class="comment">//创建了MarshallingConfiguration对象，配置了版本号为5</span></span><br><span class="line">		<span class="keyword">final</span> MarshallingConfiguration configuration = <span class="keyword">new</span> MarshallingConfiguration();</span><br><span class="line">		configuration.setVersion(<span class="number">5</span>);</span><br><span class="line">		<span class="comment">//根据marshallerFactory和configuration创建provider</span></span><br><span class="line">		UnmarshallerProvider provider = <span class="keyword">new</span> DefaultUnmarshallerProvider(marshallerFactory, configuration);</span><br><span class="line">		<span class="comment">//构建Netty的MarshallingDecoder对象，俩个参数分别为provider和单个消息序列化后的最大长度</span></span><br><span class="line">		MarshallingDecoder decoder = <span class="keyword">new</span> MarshallingDecoder(provider, <span class="number">1024</span>);</span><br><span class="line">		<span class="keyword">return</span> decoder;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * 创建Jboss Marshalling编码器MarshallingEncoder</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@return</span> MarshallingEncoder</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> MarshallingEncoder <span class="title">buildMarshallingEncoder</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">final</span> MarshallerFactory marshallerFactory = Marshalling.getProvidedMarshallerFactory(<span class="string">"serial"</span>);</span><br><span class="line">		<span class="keyword">final</span> MarshallingConfiguration configuration = <span class="keyword">new</span> MarshallingConfiguration();</span><br><span class="line">		configuration.setVersion(<span class="number">5</span>);</span><br><span class="line">		MarshallerProvider provider = <span class="keyword">new</span> DefaultMarshallerProvider(marshallerFactory, configuration);</span><br><span class="line">		<span class="comment">//构建Netty的MarshallingEncoder对象，MarshallingEncoder用于实现序列化接口的POJO对象序列化为二进制数组</span></span><br><span class="line">		MarshallingEncoder encoder = <span class="keyword">new</span> MarshallingEncoder(provider);</span><br><span class="line">		<span class="keyword">return</span> encoder;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h6 id="第三步：我们现在相应的规则已经建立，并且”运行“规则的代码也OK，所以运行上面的-public-static-void-main-String-args-启动服务端。"><a href="#第三步：我们现在相应的规则已经建立，并且”运行“规则的代码也OK，所以运行上面的-public-static-void-main-String-args-启动服务端。" class="headerlink" title="第三步：我们现在相应的规则已经建立，并且”运行“规则的代码也OK，所以运行上面的   public static void main(String[] args) 启动服务端。"></a>第三步：我们现在相应的规则已经建立，并且”运行“规则的代码也OK，所以运行上面的   public static void main(String[] args) 启动服务端。</h6><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//将规则跑起来</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">    <span class="comment">//主类中实现</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h6 id="第四步-就是编写我们的客户端Handler"><a href="#第四步-就是编写我们的客户端Handler" class="headerlink" title="第四步 就是编写我们的客户端Handler"></a>第四步 就是编写我们的客户端Handler</h6><p>其实ClientHandler和ServerHandler 非常类似 其原理是一样的 代码几乎一样 只是具体实现的业务逻辑不通<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ClienHeartBeattHandler</span> <span class="keyword">extends</span> <span class="title">ChannelHandlerAdapter</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(<span class="number">1</span>);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> ScheduledFuture&lt;?&gt; heartBeat;</span><br><span class="line">	<span class="comment">//主动向服务器发送认证信息</span></span><br><span class="line">    <span class="keyword">private</span> InetAddress addr ;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> String SUCCESS_KEY = <span class="string">"auth_success_key"</span>;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">channelActive</span><span class="params">(ChannelHandlerContext ctx)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		addr = InetAddress.getLocalHost();</span><br><span class="line">        String ip = addr.getHostAddress();</span><br><span class="line">		String key = <span class="string">"1234"</span>;</span><br><span class="line">		<span class="comment">//证书</span></span><br><span class="line">		String auth = ip + <span class="string">","</span> + key;</span><br><span class="line">		ctx.writeAndFlush(auth);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">channelRead</span><span class="params">(ChannelHandlerContext ctx, Object msg)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">    	<span class="keyword">try</span> &#123;</span><br><span class="line">        	<span class="keyword">if</span>(msg <span class="keyword">instanceof</span> String)&#123;</span><br><span class="line">        		String ret = (String)msg;</span><br><span class="line">        		<span class="keyword">if</span>(SUCCESS_KEY.equals(ret))&#123;</span><br><span class="line">        	    	<span class="comment">// 握手成功，主动发送心跳消息</span></span><br><span class="line">        	    	<span class="keyword">this</span>.heartBeat = <span class="keyword">this</span>.scheduler.scheduleWithFixedDelay(<span class="keyword">new</span> HeartBeatTask(ctx), <span class="number">0</span>, <span class="number">2</span>, TimeUnit.SECONDS);</span><br><span class="line">        		    System.out.println(msg);    			</span><br><span class="line">        		&#125;</span><br><span class="line">        		<span class="keyword">else</span> &#123;</span><br><span class="line">        			System.out.println(msg);</span><br><span class="line">        		&#125;</span><br><span class="line">        	&#125;</span><br><span class="line">		&#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">			ReferenceCountUtil.release(msg);</span><br><span class="line">		&#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="class"><span class="keyword">class</span> <span class="title">HeartBeatTask</span> <span class="keyword">implements</span> <span class="title">Runnable</span> </span>&#123;</span><br><span class="line">    	<span class="keyword">private</span> <span class="keyword">final</span> ChannelHandlerContext ctx;</span><br><span class="line"></span><br><span class="line">		<span class="function"><span class="keyword">public</span> <span class="title">HeartBeatTask</span><span class="params">(<span class="keyword">final</span> ChannelHandlerContext ctx)</span> </span>&#123;</span><br><span class="line">		    <span class="keyword">this</span>.ctx = ctx;</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">		<span class="meta">@Override</span></span><br><span class="line">		<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line">			<span class="keyword">try</span> &#123;</span><br><span class="line">			    RequestInfo info = <span class="keyword">new</span> RequestInfo();</span><br><span class="line">			    <span class="comment">//ip</span></span><br><span class="line">			    info.setIp(addr.getHostAddress());</span><br><span class="line">		        Sigar sigar = <span class="keyword">new</span> Sigar();</span><br><span class="line">		        <span class="comment">//cpu prec</span></span><br><span class="line">		        CpuPerc cpuPerc = sigar.getCpuPerc();</span><br><span class="line">		        HashMap&lt;String, Object&gt; cpuPercMap = <span class="keyword">new</span> HashMap&lt;String, Object&gt;();</span><br><span class="line">		        cpuPercMap.put(<span class="string">"combined"</span>, cpuPerc.getCombined());</span><br><span class="line">		        cpuPercMap.put(<span class="string">"user"</span>, cpuPerc.getUser());</span><br><span class="line">		        cpuPercMap.put(<span class="string">"sys"</span>, cpuPerc.getSys());</span><br><span class="line">		        cpuPercMap.put(<span class="string">"wait"</span>, cpuPerc.getWait());</span><br><span class="line">		        cpuPercMap.put(<span class="string">"idle"</span>, cpuPerc.getIdle());</span><br><span class="line">		        <span class="comment">// memory</span></span><br><span class="line">		        Mem mem = sigar.getMem();</span><br><span class="line">				HashMap&lt;String, Object&gt; memoryMap = <span class="keyword">new</span> HashMap&lt;String, Object&gt;();</span><br><span class="line">				memoryMap.put(<span class="string">"total"</span>, mem.getTotal() / <span class="number">1024L</span>);</span><br><span class="line">				memoryMap.put(<span class="string">"used"</span>, mem.getUsed() / <span class="number">1024L</span>);</span><br><span class="line">				memoryMap.put(<span class="string">"free"</span>, mem.getFree() / <span class="number">1024L</span>);</span><br><span class="line">				info.setCpuPercMap(cpuPercMap);</span><br><span class="line">			    info.setMemoryMap(memoryMap);</span><br><span class="line">			    ctx.writeAndFlush(info);</span><br><span class="line"></span><br><span class="line">			&#125; <span class="keyword">catch</span> (Exception e) &#123;</span><br><span class="line">				e.printStackTrace();</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">	    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">exceptionCaught</span><span class="params">(ChannelHandlerContext ctx, Throwable cause)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">	    	cause.printStackTrace();</span><br><span class="line">			<span class="keyword">if</span> (heartBeat != <span class="keyword">null</span>) &#123;</span><br><span class="line">			    heartBeat.cancel(<span class="keyword">true</span>);</span><br><span class="line">			    heartBeat = <span class="keyword">null</span>;</span><br><span class="line">			&#125;</span><br><span class="line">			ctx.fireExceptionCaught(cause);</span><br><span class="line">	    &#125;</span><br><span class="line"></span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>以上就是客户端ClientHandler的代码；</p>
<h5 id="第五步-就是编写客户端连接服务端的代码"><a href="#第五步-就是编写客户端连接服务端的代码" class="headerlink" title="第五步 就是编写客户端连接服务端的代码"></a>第五步 就是编写客户端连接服务端的代码</h5><p>&#8195;&#8195; 客户端负责连接服务端 只会进行发送数据，不进行通道的管理 所以比起服务端代码更为简单\<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Client</span> </span>&#123;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> Exception</span>&#123;</span><br><span class="line"></span><br><span class="line">		EventLoopGroup group = <span class="keyword">new</span> NioEventLoopGroup();</span><br><span class="line">		Bootstrap b = <span class="keyword">new</span> Bootstrap();</span><br><span class="line">		b.group(group)</span><br><span class="line">		 .channel(NioSocketChannel.class)</span><br><span class="line">		 .handler(<span class="keyword">new</span> ChannelInitializer&lt;SocketChannel&gt;() &#123;</span><br><span class="line">			<span class="meta">@Override</span></span><br><span class="line">			<span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">initChannel</span><span class="params">(SocketChannel sc)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">				sc.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingDecoder());</span><br><span class="line">				sc.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingEncoder());</span><br><span class="line">				sc.pipeline().addLast(<span class="keyword">new</span> ClienHeartBeattHandler());</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;);</span><br><span class="line"></span><br><span class="line">		ChannelFuture cf = b.connect(<span class="string">"127.0.0.1"</span>, <span class="number">8765</span>).sync();</span><br><span class="line"></span><br><span class="line">		cf.channel().closeFuture().sync();</span><br><span class="line">		group.shutdownGracefully();</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>最后一个就是把Client 跑起来<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> Exception</span>&#123;</span><br><span class="line">  <span class="comment">//主类中实现</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<h5 id="在此之外我们也把两个请求体和响应体理出来；"><a href="#在此之外我们也把两个请求体和响应体理出来；" class="headerlink" title="在此之外我们也把两个请求体和响应体理出来；"></a>在此之外我们也把两个请求体和响应体理出来；</h5><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">RequestInfo</span> <span class="keyword">implements</span> <span class="title">Serializable</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">private</span> String ip ;</span><br><span class="line">	<span class="keyword">private</span> HashMap&lt;String, Object&gt; cpuPercMap ;</span><br><span class="line">	<span class="keyword">private</span> HashMap&lt;String, Object&gt; memoryMap;</span><br><span class="line">	<span class="comment">//.. other field</span></span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">getIp</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> ip;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setIp</span><span class="params">(String ip)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.ip = ip;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="function"><span class="keyword">public</span> HashMap&lt;String, Object&gt; <span class="title">getCpuPercMap</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> cpuPercMap;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setCpuPercMap</span><span class="params">(HashMap&lt;String, Object&gt; cpuPercMap)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.cpuPercMap = cpuPercMap;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="function"><span class="keyword">public</span> HashMap&lt;String, Object&gt; <span class="title">getMemoryMap</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> memoryMap;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setMemoryMap</span><span class="params">(HashMap&lt;String, Object&gt; memoryMap)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.memoryMap = memoryMap;</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h5 id="Client端输出结果："><a href="#Client端输出结果：" class="headerlink" title="Client端输出结果："></a>Client端输出结果：</h5><figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">auth_success_key</span><br><span class="line">info received!</span><br><span class="line">info received!</span><br><span class="line">info received!</span><br></pre></td></tr></table></figure>
<h5 id="S端输出结果："><a href="#S端输出结果：" class="headerlink" title="S端输出结果："></a>S端输出结果：</h5><figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line">[21:44:09] nioEventLoopGroup-0-3 INFO  [] [] [io.netty.handler.logging.LoggingHandler] - [id: 0x3d624d69, /0:0:0:0:0:0:0:0:8765] RECEIVED: [id: 0x1cf8d8cf, /127.0.0.1:50884 =&gt; /127.0.0.1:8765]</span><br><span class="line">msg --- 192.168.0.1,1234msg --- bhz.netty.heartBeat.RequestInfo@5c64311e--------------------------------------------</span><br><span class="line">当前主机ip为: 192.168.0.1</span><br><span class="line">当前主机cpu情况:</span><br><span class="line">总使用率: 0.06953476738369185</span><br><span class="line">用户使用率: 0.05027513756878439</span><br><span class="line">系统使用率: 0.019259629814907454</span><br><span class="line">等待率: 0.0</span><br><span class="line">空闲率: 0.9304652326163082</span><br><span class="line">当前主机memory情况:</span><br><span class="line">内存总量: 16679488</span><br><span class="line">当前内存使用量: 8322796</span><br><span class="line">当前内存剩余量: 8356692</span><br><span class="line">--------------------------------------------</span><br><span class="line">msg --- bhz.netty.heartBeat.RequestInfo@7b982a0c--------------------------------------------</span><br><span class="line">当前主机ip为: 192.168.0.1</span><br><span class="line">当前主机cpu情况:</span><br><span class="line">总使用率: 0.10532868525896413</span><br><span class="line">用户使用率: 0.058515936254980076</span><br><span class="line">系统使用率: 0.046812749003984064</span><br><span class="line">等待率: 0.0</span><br><span class="line">空闲率: 0.8909362549800797</span><br><span class="line">当前主机memory情况:</span><br><span class="line">内存总量: 16679488</span><br><span class="line">当前内存使用量: 8324864</span><br><span class="line">当前内存剩余量: 8354624</span><br></pre></td></tr></table></figure>
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        <p><span>本文标题:</span><a href="/maoge-blog/2018/05/05/花神(maoge)/2.网络编程/12.网络编程--Netty-实践-心跳检测/">12.网络编程--Netty-实践-心跳检测</a></p>
        <p><span>文章作者:</span><a href="/" title="回到主页">zhengweiMao</a></p>
        <p><span>发布时间:</span>2018-05-05, 02:01:32</p>
        <p><span>最后更新:</span>2018-08-06, 23:27:19</p>
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            <span>原始链接:</span><a class="post-url" href="/maoge-blog/2018/05/05/花神(maoge)/2.网络编程/12.网络编程--Netty-实践-心跳检测/" title="12.网络编程--Netty-实践-心跳检测">https://maozw.gitee.io/maoge-blog/2018/05/05/花神(maoge)/2.网络编程/12.网络编程--Netty-实践-心跳检测/</a>
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            <ol class="toc"><li class="toc-item toc-level-3"><a class="toc-link" href="#12-网络编程–Netty-实践-心跳检测"><span class="toc-number">1.</span> <span class="toc-text">12.网络编程–Netty-实践-心跳检测</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#序言"><span class="toc-number">1.0.1.</span> <span class="toc-text">序言</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#服务端开发"><span class="toc-number">1.0.2.</span> <span class="toc-text">服务端开发</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#下面我们看下示例："><span class="toc-number">1.0.3.</span> <span class="toc-text">下面我们看下示例：</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#第一步：服务端开发-WebSocketServer启动类。"><span class="toc-number">1.0.4.</span> <span class="toc-text">第一步：服务端开发 WebSocketServer启动类。</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#第一步-建立接收消息的处理规则-其实已经发现了-服务端的代码其实都是差不多-模板一样-只是对于Handler存在差异"><span class="toc-number">1.0.5.</span> <span class="toc-text">第一步 建立接收消息的处理规则 其实已经发现了 服务端的代码其实都是差不多 模板一样 只是对于Handler存在差异</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#第二步：实现Server-建立相应的规则，配置参数-编程模式还是一样。"><span class="toc-number">1.0.6.</span> <span class="toc-text">第二步：实现Server 建立相应的规则，配置参数 编程模式还是一样。</span></a><ol class="toc-child"><li class="toc-item toc-level-6"><a class="toc-link" href="#第三步-创建Jboss-Marshalling解码器MarshallingDecoder"><span class="toc-number">1.0.6.1.</span> <span class="toc-text">第三步 创建Jboss Marshalling解码器MarshallingDecoder</span></a></li><li class="toc-item toc-level-6"><a class="toc-link" href="#第三步：我们现在相应的规则已经建立，并且”运行“规则的代码也OK，所以运行上面的-public-static-void-main-String-args-启动服务端。"><span class="toc-number">1.0.6.2.</span> <span class="toc-text">第三步：我们现在相应的规则已经建立，并且”运行“规则的代码也OK，所以运行上面的   public static void main(String[] args) 启动服务端。</span></a></li><li class="toc-item toc-level-6"><a class="toc-link" href="#第四步-就是编写我们的客户端Handler"><span class="toc-number">1.0.6.3.</span> <span class="toc-text">第四步 就是编写我们的客户端Handler</span></a></li></ol></li><li class="toc-item toc-level-5"><a class="toc-link" href="#第五步-就是编写客户端连接服务端的代码"><span class="toc-number">1.0.7.</span> <span class="toc-text">第五步 就是编写客户端连接服务端的代码</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#在此之外我们也把两个请求体和响应体理出来；"><span class="toc-number">1.0.8.</span> <span class="toc-text">在此之外我们也把两个请求体和响应体理出来；</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#Client端输出结果："><span class="toc-number">1.0.9.</span> <span class="toc-text">Client端输出结果：</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#S端输出结果："><span class="toc-number">1.0.10.</span> <span class="toc-text">S端输出结果：</span></a></li></ol></li></ol></li></ol>
        
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